US8653705B2 - Stator cooling device - Google Patents

Stator cooling device Download PDF

Info

Publication number
US8653705B2
US8653705B2 US13/282,925 US201113282925A US8653705B2 US 8653705 B2 US8653705 B2 US 8653705B2 US 201113282925 A US201113282925 A US 201113282925A US 8653705 B2 US8653705 B2 US 8653705B2
Authority
US
United States
Prior art keywords
injection hole
outer peripheral
peripheral portion
stator
cooling medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active, expires
Application number
US13/282,925
Other versions
US20120126641A1 (en
Inventor
Satoshi Murakami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisin AW Co Ltd
Original Assignee
Aisin AW Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aisin AW Co Ltd filed Critical Aisin AW Co Ltd
Assigned to AISIN AW CO., LTD. reassignment AISIN AW CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MURAKAMI, SATOSHI
Publication of US20120126641A1 publication Critical patent/US20120126641A1/en
Application granted granted Critical
Publication of US8653705B2 publication Critical patent/US8653705B2/en
Active legal-status Critical Current
Adjusted expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators

Definitions

  • the present invention relates to a stator cooling device, and specifically, relates to a stator cooling device provided with a cooling medium flow passage.
  • a stator cooling device for cooling a stator core of a rotary electric machine that functions as at least one of a motor and a generator.
  • the stator cooling device may include a cooling medium flow passage.
  • a cooling medium is supplied to the stator core through a downward hole that opens vertically downward in the cooling medium flow passage such that the cooling medium falls by the force of gravity to flow downward along an outer peripheral portion of the stator core. In this manner, heat exchange is performed (see Japanese Patent Application Publication No. JP-A-2008-178243).
  • the stator core described above includes a cylindrical stator main body that uses a rotation axis of the rotary electric machine as a central axis, and a fixed portion that fixes the stator main body to a housing case that is a case that houses the rotary electric machine.
  • the fixed portion is disposed at least one location on an outer peripheral portion of the stator main body above a horizontal plane that passes through the central axis of the stator main body, so as to firmly fix the stator main body to the housing case. Further, the fixed portion is formed to protrude from the outer peripheral portion of the stator main body outward in a radial direction of the stator main body.
  • the stator core includes the fixed portion as in the related art described above, the following problem may occur when the related art is applied to supply the cooling medium to the stator core through the downward hole in the cooling medium flow passage such that the cooling medium falls by the force of gravity to flow downward along the outer peripheral portion of the stator core.
  • the related art when the cooling medium flows downward, the flow of the cooling medium may be blocked by the fixed portion.
  • the cooling medium does not flow downward to reach the outer peripheral portion that is lower than the fixed portion, and it may not be possible to cool that particular portion. Consequently, the stator main body may be cooled in an uneven manner.
  • the present invention was devised in order to at least partially solve the problem described above, and may be embodied as modes or aspects that will be described below.
  • a stator cooling device includes a cylindrical stator main body that uses a rotation axis of a rotary electric machine as a central axis, a fixed portion that is formed on an outer peripheral portion of the stator main body so as to protrude outward in a radial direction of the stator main body, and fixes the stator main body to a case that houses the rotary electric machine, and a cooling medium flow passage into which a cooling medium is supplied and that includes an injection hole through which the cooling medium is injected.
  • the fixed portion is disposed above a horizontal plane that passes through the central axis, and a peak portion that is farthest in the fixed portion from the central axis as viewed in an axial direction of the central axis is disposed at a position displaced from a first vertical plane that is a vertical plane that passes through the central axis.
  • the injection hole opens toward the fixed portion above the outer peripheral portion of the stator main body and toward the first vertical plane side with respect to a second vertical plane that is a vertical plane that passes through the peak portion.
  • the fixed portion is disposed above the horizontal plane that passes through the central axis of the stator main body, and the peak portion is disposed at a position displaced from the first vertical plane as viewed in the axial direction.
  • the injection hole in the cooling medium flow passage is formed to open toward the fixed portion.
  • the cooling medium injected through the injection hole can directly impact and pass over the fixed portion, and flow downward toward the outer peripheral portion that is lower than the fixed portion in the stator main body, whereby it is possible to cool the outer peripheral portion that is lower than the fixed portion. Consequently, uneven cooling of the stator main body can be suppressed.
  • the injection hole in the cooling medium flow passage is disposed above the outer peripheral portion of the stator main body and on the first vertical plane side with respect to the second vertical plane that passes through the peak portion of the fixed portion. Accordingly, the cooling medium can be injected such that the cooling medium directly impacts the fixed portion and passes over the fixed portion.
  • the cooling medium may be injected through the injection hole such that an angle, which is an inferior angle, is obtusely formed between a line segment, which is a line segment that is on a tangent line passing through an impact position at which the cooling medium injected through the injection hole impacts the fixed portion, and that extends from the impact position toward the peak portion side, and another line segment, which passes through the impact position and the injection hole.
  • the cooling medium is injected through the injection hole such that the angle, which is an inferior angle, is obtusely formed between the line segment, which is a line segment that is on the tangent line passing through the impact position at which the cooling medium impacts the fixed portion, and that extends from the impact position toward the peak portion side, and another line segment, which passes through the impact position and the injection hole.
  • the cooling medium injected through the injection hole can easily pass over the fixed portion and flow downward toward the outer peripheral portion that is lower than the fixed portion in the stator main body, thereby promoting the cooling of the outer peripheral portion that is lower than the fixed portion.
  • At least part of the injection hole may be disposed inward of a circle that is formed about the central axis and passes through the peak portion as viewed in the axial direction.
  • stator cooling device of the third aspect at least part of the injection hole is disposed inward of the circle that is formed about the axis and passes through the peak portion as viewed in the axial direction.
  • the cooling medium flow passage may include a second injection hole that is different from the first injection hole, and through which the cooling medium is injected toward a second outer peripheral portion, wherein a first outer peripheral portion and the second outer peripheral portion are formed by dividing the outer peripheral portion of the stator main body above the horizontal plane that passes through the central axis by the first vertical plane that passes through the central axis such that the fixed portion is disposed in the first outer peripheral portion, and the second outer peripheral portion is opposite the first outer peripheral portion.
  • the cooling medium flow passage includes the second injection hole through which the cooling medium is injected toward the second outer peripheral portion that is opposite the first outer peripheral portion where the fixed portion is disposed, with the first outer peripheral portion and the second outer peripheral portion formed by dividing the outer peripheral portion above the horizontal plane that passes through the central axis by the first vertical plane that passes through the central axis.
  • the cooling medium can be injected to the second outer peripheral portion in addition to the first outer peripheral portion, whereby it is possible to cool the second outer peripheral portion.
  • the cooling medium injected to the second outer peripheral portion flows downward toward and thus can cool the outer peripheral portion that is lower than the second outer peripheral portion. Consequently, in the stator main body, it is possible to cool the outer peripheral portion that includes the second outer peripheral portion among the outer peripheral portion divided by the first vertical plane. Accordingly, uneven cooling of the stator main body can further be suppressed.
  • the first injection hole and the second injection hole may be disposed at a same position in the axial direction.
  • the first injection hole and the second injection hole are disposed at the same position in the axial direction.
  • the cooling medium is injected from the same position in the axial direction toward each of the first outer peripheral portion and the second outer peripheral portion. Accordingly, uneven cooling between the first outer peripheral portion side and the second outer peripheral portion side in the axial direction can be suppressed. Specifically, it is possible to suppress uneven cooling between positions on the first outer peripheral portion side and the second outer peripheral portion side that are symmetrical in the axial direction with respect to the first vertical plane.
  • the first injection hole may have a smaller diameter than the second injection hole.
  • the first injection hole has a smaller diameter than the second injection hole.
  • the cooling medium can be more strongly injected through the first injection hole compared to the second injection hole. Accordingly, the cooling medium injected through the first injection hole can easily pass over the fixed portion, and therefore, a large amount of cooling medium can flow downward toward the outer peripheral portion that is lower than the fixed portion. Consequently, it is possible to suppress uneven cooling of the outer peripheral portion that is lower than the fixed portion.
  • the present invention may be embodied in forms representing various devices, such as a rotary electric machine unit, a rotary electric machine, a cooling medium flow passage, a stator, and a vehicle provided with a stator cooling device, for example.
  • the present invention may be embodied in forms representing various methods, such as a cooling method for cooling a stator.
  • FIG. 1 is a view showing a cross section of a rotary electric machine unit 1000 serving as an embodiment of the present invention
  • FIG. 2 is an exploded perspective view of the rotary electric machine unit 1000 ;
  • FIG. 3 is a cross-sectional view taken along a line A-A in FIG. 1 ;
  • FIG. 4 is an enlarged view of a region CC in FIG. 3 ;
  • FIG. 5 is a cross-sectional view taken along a line D-D in FIG. 4 ;
  • FIG. 6 is a view showing a first injection hole 300 A and a second injection hole 300 B in a cooling medium flow passage 300 as a second embodiment
  • FIG. 7 is a view illustrating a first modification example
  • FIG. 8 is a view illustrating a second modification example.
  • FIG. 1 is a view showing a cross section of a rotary electric machine unit 1000 serving as a first embodiment of the present invention.
  • an up-down direction serves as a vertical direction
  • a left-right direction serves as a horizontal direction
  • an x direction, a y direction, and a z direction are defined as illustrated in FIG. 1 .
  • the z direction is an upward direction along the vertical direction
  • the x direction and the y direction are directions along the horizontal direction.
  • the x direction is orthogonal to the y direction.
  • the x direction is a rightward direction in FIG. 1
  • the y direction is a direction extending along a direction heading into the paper in FIG. 1 .
  • FIG. 2 is an exploded perspective view showing the rotary electric machine unit 1000 .
  • FIG. 1 corresponds to a view of a cross section taken along a line B-B in FIG. 2 as viewed from the y direction.
  • FIG. 3 is a cross-sectional view taken along a line A-A in FIG. 1 .
  • FIG. 3 is a view of a cross section taken along the line A-A in FIG. 1 as viewed from the x direction.
  • the rotary electric machine unit 1000 includes a rotary electric machine 100 , a housing case 200 , a cooling medium flow passage 300 , and screws 400 , 500 .
  • the cooling medium flow passage 300 will be described in detail later.
  • the rotary electric machine 100 includes a stator 10 , a rotor 50 , and a shaft 60 , as shown in FIGS. 1 to 3 .
  • the rotary electric machine unit 1000 (rotary electric machine 100 ) is disposed such that the shaft 60 is parallel to the x direction (horizontal direction).
  • the rotary electric machine 100 functions as a motor and a generator.
  • the rotor 50 is cylindrically formed, and a magnet is disposed inside the rotor 50 .
  • the rotor 50 is fixed to the shaft 60 .
  • the stator 10 includes a stator core 20 and a coil 30 as shown in FIGS. 1 to 3 .
  • the stator core 20 is formed by laminating a plurality of stator laminated plates (not shown), each of which is a ring-shaped steel plate.
  • the stator core 20 thus formed includes a stator main body 21 that is cylindrically formed, and a fixed portion group 25 .
  • the stator main body 21 includes a plurality of slot portions 21 A disposed on an inner peripheral portion of the stator main body 21 at the same pitch.
  • the coil 30 is wound in the slot portions 21 A.
  • a central axis of the stator core 20 (stator main body 21 ) coincides with a rotation axis of the rotary electric machine 100 (shaft 60 ).
  • the central axis will also be referred to as a central axis T.
  • a direction along the central axis T will also be referred to as an axial direction.
  • the axial direction coincides with the horizontal direction.
  • a direction extending from the stator main body 21 toward the central axis T will also be referred to as a radially inward direction
  • a direction extending away from the central axis T and opposite the radially inward direction will also be referred to as a radially outward direction.
  • the fixed portion group 25 is formed of three fixed portions, that is, a first fixed portion 25 A, a second fixed portion 25 B, and a third fixed portion 25 C, as shown in FIGS. 2 and 3 .
  • These three fixed portions are each formed on an outer peripheral portion of the stator main body 21 to protrude therefrom in the radially outward direction.
  • the three fixed portions are each formed into a substantially semi-cylindrical shape of the same size, and a semi-circular surface of each of the fixed portions faces toward the radially outward direction.
  • the three fixed portions are each formed on the outer peripheral portion of the stator main body 21 so as to protrude therefrom in a direction opposite the direction extending toward the central axis T as viewed in the axial direction (X direction).
  • the first fixed portion 25 A corresponds to a fixed portion according to the claims.
  • the three fixed portions each include a through hole 25 X that penetrates through the fixed portion in the axial direction, and a peak portion 25 Y that is a portion farthest of the fixed portion from the central axis T as viewed in the axial direction.
  • the three fixed portions are disposed in the stator core 20 such that a triangle formed by connecting the peak portions 25 Y of the three fixed portions is an equilateral triangle.
  • the three fixed portions are disposed on the outer peripheral portion of the stator core 20 such that an interval between two adjacent fixed portions as viewed in the axial direction is equal.
  • the first fixed portion 25 A is disposed at a position above a horizontal plane (hereinafter also referred to as a horizontal plane M 1 ) that passes through the central axis T, and the peak portion 25 Y of the first fixed portion 25 A is disposed at a position displaced from a vertical plane (hereinafter also referred to as a first vertical plane N 1 ) that passes through the central axis T.
  • the second fixed portion 25 B and the third fixed portion 25 C are disposed at positions below the horizontal plane M 1 .
  • the housing case 200 includes a case lid portion 200 A and a case body portion 200 B, as shown in FIGS. 1 to 3 .
  • the rotary electric machine 100 is housed inside the housing case 200 .
  • the case body portion 200 B includes three recessed portions 201 in which the three fixed portions of the fixed portion group 25 are respectively disposed, and a recessed portion 202 in which the cooling medium flow passage 300 is disposed.
  • a predetermined clearance is provided between each recessed portion 201 and corresponding fixed portion.
  • a predetermined clearance is also provided between the case body portion 200 B and the stator main body 21 . These clearances are capable of functioning as flow passages (described later) through which a cooling medium flows.
  • the screw 400 fixes the case lid portion 200 A to the case body portion 200 B.
  • the screw 500 is inserted into each through hole 25 X (described later) that is axially formed in the fixed portion group 25 of the stator core 20 , and fixes the stator core 20 to the case body portion 200 B.
  • stator core 20 (in particular, the stator main body 21 and the first fixed portion 25 A overall) and the cooling medium flow passage 300 overall correspond to a stator cooling device according to the claims.
  • stator core 20 and the cooling medium flow passage 300 will also be referred to overall as a stator cooling device 90 .
  • FIG. 4 is an enlarged view showing a region CC in FIG. 3 .
  • FIG. 5 is a view showing a cross section taken along a line D-D in FIG. 4 .
  • the cooling medium flow passage 300 is a flow passage to which the cooling medium (for example, cooling oil or the like) for cooling the stator core 20 is supplied from a pump (not shown) disposed external to the rotary electric machine unit 1000 .
  • the cooling medium flow passage 300 is disposed in the recessed portion 202 formed in the case body portion 200 B so as to be parallel to the central axis T, as shown in FIGS. 2 to 4 .
  • the cooling medium flow passage 300 is disposed above the outer peripheral portion of the stator main body 21 and on the first vertical plane N 1 side with respect to a vertical plane (hereinafter also referred to as a second vertical plane N 2 ) that passes through the peak portion 25 Y of the first fixed portion 25 A.
  • a vertical plane hereinafter also referred to as a second vertical plane N 2
  • the cooling medium flow passage 300 is disposed on the first vertical plane N 1 , above an uppermost portion 21 Y that is the highest region of the stator main body 21 , and inward of a circle E that is formed about the central axis T and passes through the peak portion 25 Y of the first fixed portion 25 A as viewed in the axial direction. As shown in FIG. 5 , the flow of the cooling medium is blocked at an end portion of the cooling medium flow passage 300 opposite the pump side.
  • the cooling medium flow passage 300 includes a first injection hole 300 A and a second injection hole 300 B.
  • the first injection hole 300 A corresponds to an injection hole that opens toward the fixed portion according to the claims.
  • the first injection hole 300 A is a hole through which the cooling medium is injected, and opens in the cooling medium flow passage 300 toward the first fixed portion 25 A.
  • the pump supplies the cooling medium to the cooling medium flow passage 300 at a sufficiently high pressure. Therefore, the first injection hole 300 A is formed such that at least part of the injected cooling medium directly impacts the first fixed portion 25 A.
  • the first injection hole 300 A is formed so as to inject the cooling medium such that an angle ⁇ , which is an inferior angle, is obtusely formed between a line segment SA and a line segment SB.
  • the line segment SA is a line segment that is on a tangent line passing through an impact position P 1 at which the cooling medium injected through the first injection hole 300 A impacts the first fixed portion 25 A, and that extends from the impact position P 1 toward the peak portion 25 Y side of the first fixed portion 25 A.
  • the line segment SB is a line segment that passes through the impact position P 1 and a substantially center of the first injection hole 300 A.
  • the impact position P 1 is any point in a region of the first fixed portion 25 A that the cooling medium injected through the first injection hole 300 A directly impacts.
  • the impact position P 1 is the center of gravity in such a region.
  • the second injection hole 300 B is a hole through which the cooling medium is injected. As shown in FIG. 4 , the second injection hole 300 B opens in the cooling medium flow passage 300 toward a side opposite the first fixed portion 25 A side.
  • the outer peripheral portion above the horizontal plane M 1 is divided by the first vertical plane N 1 that passes through the central axis T.
  • the outer peripheral portion is divided into the outer peripheral portion where the first fixed portion 25 A is disposed (which will be referred to as a first outer peripheral portion UA), and the outer peripheral portion that is opposite the first outer peripheral portion UA (which will be referred to as a second outer peripheral portion UB).
  • the second injection hole 300 B is formed so as to inject the cooling medium toward the second outer peripheral portion UB.
  • the first injection hole 300 A and the second injection hole 300 B are disposed at the same position in the axial direction, as shown in FIG. 4 . Moreover, the diameter of the first injection hole 300 A is the same as that of the second injection hole 300 B.
  • the rotary electric machine unit 1000 includes a discharge portion (not shown) for discharging the cooling medium.
  • the cooling medium injected through the first injection hole 300 A and the second injection hole 300 B in the cooling medium flow passage 300 flows downward along the outer peripheral portion of the stator core 20 and reaches the lower portion of the stator core 20 .
  • the cooling medium is then discharged from the discharge portion to outside the rotary electric machine unit 1000 ,
  • the cooling medium discharged from the discharge portion is cooled by a radiator (not shown) or the like disposed external to the rotary electric machine unit 1000 , and again fed to the cooling medium flow passage 300 by the pump.
  • the cooling medium flow passage 300 of the present embodiment includes, in addition to the first injection hole 300 A and the second injection hole 300 B, a plurality of injection holes 300 X through which the cooling medium is injected to cool the coil 30 .
  • the cooling medium supplied to the cooling medium flow passage 300 is injected through any one of the first injection hole 300 A, the second injection hole 300 B, and the injection holes 300 X.
  • the first fixed portion 25 A is disposed in the stator core 20 at a position above the horizontal plane M 1 that passes through the central axis T of the stator main body 21 , and the peak portion 25 Y is disposed at a position displaced from the first vertical plane N 1 as viewed in the axial direction.
  • the first injection hole 300 A of the cooling medium flow passage 300 opens toward the first fixed portion 25 A.
  • the cooling medium injected through the first injection hole 300 A can directly impact and pass over the first fixed portion 25 A, and flow downward toward the outer peripheral portion that is lower than the first fixed portion 25 A in the stator core 20 (the outer peripheral portion that is lower than the first fixed portion 25 A and on the right side of the first vertical plane N 1 in the stator core 20 in FIG. 3 ).
  • This makes it possible to cool the outer peripheral portion that is lower than the first fixed portion 25 A. Consequently, uneven cooling of the stator core 20 (stator main body 21 ) can be suppressed.
  • the cooling medium flow passage 300 (first injection hole 300 A) is disposed above the outer peripheral portion of the stator main body 21 and on the first vertical plane N 1 side with respect to the second vertical plane N 2 that passes through the peak portion 25 Y of the first fixed portion 25 A.
  • the cooling medium can be injected through the first injection hole 300 A such that the cooling medium directly impacts the first fixed portion 25 A and passes over the first fixed portion 25 A.
  • the cooling medium is injected through the first injection hole 300 A such that the angle ⁇ , which is an inferior angle, is obtusely formed between the line segment SA and the line segment SB, with the line segment SA being a line segment that is on the tangent line passing through the impact position P 1 at which the cooling medium impacts the first fixed portion 25 A, and that extends from the impact position P 1 toward the peak portion 25 Y side of the first fixed portion 25 A, and the line segment SB passing through the impact position P 1 and the substantially center of the first injection hole 300 A.
  • the angle ⁇ which is an inferior angle
  • the cooling medium injected through the first injection hole 300 A can easily pass over the first fixed portion 25 A and flow downward toward the outer peripheral portion that is lower than the first fixed portion 25 A in the stator core 20 (the outer peripheral portion that is lower than the first fixed portion 25 A and on the right side of the first vertical plane N 1 in the stator core 20 in FIG. 3 ), thereby promoting the cooling of the outer peripheral portion that is lower than the first fixed portion 25 A.
  • the rotary electric machine unit 1000 of the present embodiment as shown in FIG. 4 , at least part of the first injection hole 300 A is disposed inward of the circle E that is formed about the central axis T and passes through the peak portion 25 Y of the first fixed portion 25 A as viewed in the axial direction.
  • the cooling medium flow passage 300 and the stator core 20 are disposed close to each other, and this makes it possible to achieve a more compact rotary electric machine unit 1000 (especially the stator cooling device 90 ).
  • the second injection hole 300 B is provided so as to inject the cooling medium toward the second outer peripheral portion UB that is on the side opposite the first outer peripheral portion UA where the first fixed portion 25 A is disposed, among the outer peripheral portion of the stator main body 21 above the horizontal plane M 1 that passes through the central axis T, which is divided by the first vertical plane N 1 that passes through the central axis T.
  • the cooling medium can be injected to the second outer peripheral portion UB in addition to the first outer peripheral portion UA, whereby it is possible to also cool the second outer peripheral portion UB.
  • the cooling medium injected toward the second outer peripheral portion UB flows downward toward and can cool the outer peripheral portion that is lower than the second outer peripheral portion UB in the stator core 20 (the outer peripheral portion that is lower than the horizontal plane M 1 and on the left side of the first vertical plane N 1 in the stator core 20 in FIG. 3 ). Consequently, in the stator core 20 , it is possible to cool the outer peripheral portion that includes the second outer peripheral portion UB among the outer peripheral portion divided by the first vertical plane N 1 (the outer peripheral portion on the left side of the first vertical plane N 1 in the stator core 20 in FIG. 3 ), whereby uneven cooling of the stator core 20 (stator main body 21 ) can be suppressed.
  • the first injection hole 300 A and the second injection hole 300 B are disposed at the same position in the axial direction.
  • the cooling medium is injected toward each of the first outer peripheral portion UA and the second outer peripheral portion UB from the same position in the axial direction. Accordingly, uneven cooling in the axial direction between the first outer peripheral portion UA side and the second outer peripheral portion UB side can be suppressed. Specifically, it is possible to suppress uneven cooling between positions on the first outer peripheral portion UA side and the second outer peripheral portion UB side that are symmetrical in the axial direction with respect to the first vertical plane N 1 .
  • the second fixed portion 258 and the third fixed portion 25 C of the stator core 20 are disposed at positions that are lower than the horizontal plane M 1 .
  • the cooling medium injected through the first injection hole 300 A and the second injection hole 300 B in the cooling medium flow passage 300 can pass over the second fixed portion 25 B and the third fixed portion 25 C by the force of gravity when the cooling medium reaches the second fixed portion 25 B and the third fixed portion 25 C. Consequently, it is possible to suppress the second fixed portion 25 B and the third fixed portion 25 C from interfering with the downward flow of the cooling medium, and thus possible to suppress uneven cooling of the stator core 20 (stator main body 21 ).
  • the three fixed portions in the fixed portion group 25 are disposed on the outer peripheral portion of the stator core 20 such that there is an equal interval between two adjacent fixed portions as viewed in the axial direction.
  • the stator core 20 can be firmly fixed to the case body portion 200 B, and it is possible to prevent the stator core 20 from rotating.
  • FIG. 6 is a view showing the first injection hole 300 A and the second injection hole 300 B in the cooling medium flow passage 300 serving as a second embodiment.
  • the first injection hole 300 A and the second injection hole 300 B are configured to have the same diameter.
  • the first injection hole 300 A is configured to have a smaller diameter than the second injection hole 300 B.
  • the first injection hole 300 A has a smaller diameter than the second injection hole 300 B.
  • the cooling medium can be more strongly injected through the first injection hole 300 A, compared to the second injection hole 300 B. Accordingly, the cooling medium injected through the first injection hole 300 A can easily pass over the first fixed portion 25 A, and therefore, a large amount of the cooling medium can flow downward toward the outer peripheral portion that is lower than the first fixed portion 25 A (the outer peripheral portion on the right side of the first vertical plane N 1 in the stator core 20 in FIG. 3 ). Consequently, it is possible to suppress uneven cooling of the outer peripheral portion that is lower than the first fixed portion 25 A.
  • the cooling medium is injected through the first injection hole 300 A such that the angle ⁇ , which is an inferior angle, is obtusely formed between the line segment SA and the line segment SB, with the line segment SA being a line segment that is on a tangent line passing through the impact position P 1 at which the cooling medium impacts the first fixed portion 25 A, and that extends from the impact position P 1 toward the peak portion 25 Y side of the first fixed portion 25 A, and the line segment SB passing through the impact position P 1 and the substantially center of the first injection hole 300 A.
  • the present invention is not limited to this example. The following configuration may be employed, for example.
  • FIG. 7 is a view illustrating a first modification example. Specifically, FIG. 7 is an enlarged view around the cooling medium flow passage 300 and the first fixed portion 25 A.
  • the first injection hole 300 A may be disposed in the cooling medium flow passage 300 such that an angle ⁇ a, which is an inferior angle, is obtusely formed between a line segment SC and a line segment SD in FIG. 7 .
  • a tangent line SS is a tangent line in the region where the first fixed portion 25 A is disposed in the stator main body 21 and passes through the substantially center of the first injection hole 300 A, and an intersection point P 2 is set as a point at which the tangent line SS intersects with a surface of the first fixed portion 25 A on the first vertical plane N 1 side.
  • the line segment SC is a line segment that is on the tangent line SS and that passes through the intersection point P 2 and the substantially center of the first injection hole 300 A.
  • the line segment SD is a line segment that is on a tangent line at the intersection point P 2 of the first fixed portion 25 A and that extends from the intersection point P 2 toward the peak portion 25 Y side of the first fixed portion 25 A.
  • the cooling medium flow passage 300 is disposed on the first vertical plane N 1 , above the uppermost portion 21 Y that is the highest region of the stator main body 21 , and inward of the circle E that is formed about the central axis T and passes through the peak portion 25 Y of the first fixed portion 25 A as viewed in the axial direction.
  • the present invention is not limited to this.
  • FIG. 8 is a view illustrating a second modification example. Specifically, FIG. 8 is a view illustrating a positional relationship between the stator core 20 (first fixed portion 25 A) and the cooling medium flow passage 300 .
  • the present invention may employ the configuration in which, as shown in FIG. 8 , the cooling medium flow passage 300 is disposed at any position in the region above the outer peripheral portion of the stator main body 21 on the first vertical plane N 1 side with respect to the second vertical plane N 2 that passes through the peak portion 25 Y of the first fixed portion 25 A (a hatched region in FIG. 8 ; hereinafter also referred to as a region MM).
  • a region MM hatched region in FIG. 8
  • the present invention may employ a configuration in which the cooling medium flow passage 300 is provided at a position in the region MM that is displaced toward the first fixed portion 25 A with respect to the first vertical plane N 1 , instead of being disposed on the first vertical plane N 1 .
  • the cooling medium flow passage 300 is disposed in the recessed portion 202 formed in the case body portion 200 B.
  • the present invention is not limited to this.
  • a passage formed by hollowing out the inside of the case body portion 200 B may be used as the cooling medium flow passage 300 .
  • the first injection hole 300 A and the second injection hole 300 B are formed by through holes that penetrate through the case body portion 200 B. With this configuration, it is no longer necessary to provide the cooling medium flow passage 300 as a separate component of the case body portion 200 B, and therefore the number of components can be reduced.
  • the cooling medium flow passage 300 is disposed inward of the circle E as viewed in the axial direction.
  • the present invention is not limited to this example.
  • the present invention may employ a configuration in which at least part of the cooling medium flow passage 300 (for example, at least part of the first injection hole 300 A) is disposed inward of the circle E. With this configuration, the rotary electric machine unit 1000 (especially the stator cooling device 90 ) can be made more compact.
  • the first injection hole 300 A and the second injection hole 300 B are disposed at the same position in the axial direction.
  • the present invention is not limited to this example.
  • the first injection hole 300 A may be disposed at a position closer to the side where the pump that feeds the cooling medium (see FIG. 5 ) is disposed, with respect to the second injection hole 300 B. With this configuration, the cooling medium can be more strongly injected through the first injection hole 300 A compared to the second injection hole 300 B.
  • the cooling medium injected through the first injection hole 300 A can easily pass over the first fixed portion 25 A, and a large amount of the cooling medium can flow downward toward the outer peripheral portion that is lower than the first fixed portion 25 A (the outer peripheral portion on the right side of the first vertical plane N 1 in the stator core 20 in FIG. 3 ). Consequently, it is possible to suppress uneven cooling of the outer peripheral portion that is lower than the first fixed portion 25 A.
  • the rotary electric machine 100 can function as both a motor and a generator.
  • the present invention is not limited to this.
  • the rotary electric machine 100 may only function as a generator without functioning as a motor.
  • the rotary electric machine 100 may only function as a motor without functioning as a generator.
  • the present invention is well suited for use in cooling a stator of a rotary electric machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

A stator cooling device configured with a cylindrical stator main body that uses a rotation axis of a rotary electric machine as a central axis. A fixed portion is formed on an outer peripheral portion of the stator main body so as to protrude outward in a radial direction of the stator main body. A cooling medium flow passage includes an injection hole through which cooling medium is injected. The fixed portion is configured above a horizontal plane that passes through the central axis, and a peak portion that is farthest in the fixed portion from the central axis as viewed in an axial direction of the central axis. The injection hole opens toward the fixed portion above the outer peripheral portion of the stator and toward the first vertical plane side with respect to a second vertical plane that is a vertical plane that passes through the peak portion.

Description

INCORPORATION BY REFERENCE
The disclosure of Japanese Patent Application No. 2010-260412 filed on Nov. 22, 2010 including the specification, drawings and abstract is incorporated herein by reference in its entirety.
BACKGROUND OF THE INVENTION
The present invention relates to a stator cooling device, and specifically, relates to a stator cooling device provided with a cooling medium flow passage.
DESCRIPTION OF THE RELATED ART
A stator cooling device is known for cooling a stator core of a rotary electric machine that functions as at least one of a motor and a generator. The stator cooling device may include a cooling medium flow passage. A cooling medium is supplied to the stator core through a downward hole that opens vertically downward in the cooling medium flow passage such that the cooling medium falls by the force of gravity to flow downward along an outer peripheral portion of the stator core. In this manner, heat exchange is performed (see Japanese Patent Application Publication No. JP-A-2008-178243).
The stator core described above includes a cylindrical stator main body that uses a rotation axis of the rotary electric machine as a central axis, and a fixed portion that fixes the stator main body to a housing case that is a case that houses the rotary electric machine. The fixed portion is disposed at least one location on an outer peripheral portion of the stator main body above a horizontal plane that passes through the central axis of the stator main body, so as to firmly fix the stator main body to the housing case. Further, the fixed portion is formed to protrude from the outer peripheral portion of the stator main body outward in a radial direction of the stator main body.
SUMMARY OF THE INVENTION
However, if the stator core includes the fixed portion as in the related art described above, the following problem may occur when the related art is applied to supply the cooling medium to the stator core through the downward hole in the cooling medium flow passage such that the cooling medium falls by the force of gravity to flow downward along the outer peripheral portion of the stator core. Specifically, in the art described above, when the cooling medium flows downward, the flow of the cooling medium may be blocked by the fixed portion. Thus, the cooling medium does not flow downward to reach the outer peripheral portion that is lower than the fixed portion, and it may not be possible to cool that particular portion. Consequently, the stator main body may be cooled in an uneven manner.
It is an object of the present invention to provide art that suppresses uneven cooling of the stator main body provided with the fixed portion.
The present invention was devised in order to at least partially solve the problem described above, and may be embodied as modes or aspects that will be described below.
[First Aspect]
A stator cooling device includes a cylindrical stator main body that uses a rotation axis of a rotary electric machine as a central axis, a fixed portion that is formed on an outer peripheral portion of the stator main body so as to protrude outward in a radial direction of the stator main body, and fixes the stator main body to a case that houses the rotary electric machine, and a cooling medium flow passage into which a cooling medium is supplied and that includes an injection hole through which the cooling medium is injected. In the stator cooling device, the fixed portion is disposed above a horizontal plane that passes through the central axis, and a peak portion that is farthest in the fixed portion from the central axis as viewed in an axial direction of the central axis is disposed at a position displaced from a first vertical plane that is a vertical plane that passes through the central axis. The injection hole opens toward the fixed portion above the outer peripheral portion of the stator main body and toward the first vertical plane side with respect to a second vertical plane that is a vertical plane that passes through the peak portion.
According to the stator cooling device of the first aspect, the fixed portion is disposed above the horizontal plane that passes through the central axis of the stator main body, and the peak portion is disposed at a position displaced from the first vertical plane as viewed in the axial direction. With this configuration, it is possible to reduce a height of the stator cooling device in a vertical direction, and also possible to make the stator cooling device more compact. In addition, according to the stator cooling device as configured above, the injection hole in the cooling medium flow passage is formed to open toward the fixed portion. With this configuration, the cooling medium injected through the injection hole can directly impact and pass over the fixed portion, and flow downward toward the outer peripheral portion that is lower than the fixed portion in the stator main body, whereby it is possible to cool the outer peripheral portion that is lower than the fixed portion. Consequently, uneven cooling of the stator main body can be suppressed. Furthermore, according to the stator cooling device as configured above, the injection hole in the cooling medium flow passage is disposed above the outer peripheral portion of the stator main body and on the first vertical plane side with respect to the second vertical plane that passes through the peak portion of the fixed portion. Accordingly, the cooling medium can be injected such that the cooling medium directly impacts the fixed portion and passes over the fixed portion.
[Second Aspect]
In the stator cooling device according to the first aspect, the cooling medium may be injected through the injection hole such that an angle, which is an inferior angle, is obtusely formed between a line segment, which is a line segment that is on a tangent line passing through an impact position at which the cooling medium injected through the injection hole impacts the fixed portion, and that extends from the impact position toward the peak portion side, and another line segment, which passes through the impact position and the injection hole.
According to the stator cooling device of the second aspect, the cooling medium is injected through the injection hole such that the angle, which is an inferior angle, is obtusely formed between the line segment, which is a line segment that is on the tangent line passing through the impact position at which the cooling medium impacts the fixed portion, and that extends from the impact position toward the peak portion side, and another line segment, which passes through the impact position and the injection hole. With this configuration, the cooling medium injected through the injection hole can easily pass over the fixed portion and flow downward toward the outer peripheral portion that is lower than the fixed portion in the stator main body, thereby promoting the cooling of the outer peripheral portion that is lower than the fixed portion.
[Third Aspect]
In the stator cooling device according to the first aspect or the second aspect, at least part of the injection hole may be disposed inward of a circle that is formed about the central axis and passes through the peak portion as viewed in the axial direction.
According to the stator cooling device of the third aspect, at least part of the injection hole is disposed inward of the circle that is formed about the axis and passes through the peak portion as viewed in the axial direction. With this configuration, the cooling medium flow passage and the stator main body are disposed close to each other, and this makes it possible to achieve a more compact stator cooling device.
[Fourth Aspect]
In the stator cooling device according to any one of the first to third aspects, if the injection hole is referred to as a first injection hole, the cooling medium flow passage may include a second injection hole that is different from the first injection hole, and through which the cooling medium is injected toward a second outer peripheral portion, wherein a first outer peripheral portion and the second outer peripheral portion are formed by dividing the outer peripheral portion of the stator main body above the horizontal plane that passes through the central axis by the first vertical plane that passes through the central axis such that the fixed portion is disposed in the first outer peripheral portion, and the second outer peripheral portion is opposite the first outer peripheral portion.
According to the stator cooling device of the fourth aspect, the cooling medium flow passage includes the second injection hole through which the cooling medium is injected toward the second outer peripheral portion that is opposite the first outer peripheral portion where the fixed portion is disposed, with the first outer peripheral portion and the second outer peripheral portion formed by dividing the outer peripheral portion above the horizontal plane that passes through the central axis by the first vertical plane that passes through the central axis. With this configuration, the cooling medium can be injected to the second outer peripheral portion in addition to the first outer peripheral portion, whereby it is possible to cool the second outer peripheral portion. Moreover, the cooling medium injected to the second outer peripheral portion flows downward toward and thus can cool the outer peripheral portion that is lower than the second outer peripheral portion. Consequently, in the stator main body, it is possible to cool the outer peripheral portion that includes the second outer peripheral portion among the outer peripheral portion divided by the first vertical plane. Accordingly, uneven cooling of the stator main body can further be suppressed.
[Fifth Aspect]
In the stator cooling device according to the fourth aspect, the first injection hole and the second injection hole may be disposed at a same position in the axial direction.
With respect to the stator cooling device of the fifth aspect, the first injection hole and the second injection hole are disposed at the same position in the axial direction. With this configuration, in the stator main body, the cooling medium is injected from the same position in the axial direction toward each of the first outer peripheral portion and the second outer peripheral portion. Accordingly, uneven cooling between the first outer peripheral portion side and the second outer peripheral portion side in the axial direction can be suppressed. Specifically, it is possible to suppress uneven cooling between positions on the first outer peripheral portion side and the second outer peripheral portion side that are symmetrical in the axial direction with respect to the first vertical plane.
[Sixth Aspect]
In the stator cooling device according to the fourth aspect or the fifth aspect, the first injection hole may have a smaller diameter than the second injection hole.
According to the stator cooling device of the sixth aspect, the first injection hole has a smaller diameter than the second injection hole. With this configuration, the cooling medium can be more strongly injected through the first injection hole compared to the second injection hole. Accordingly, the cooling medium injected through the first injection hole can easily pass over the fixed portion, and therefore, a large amount of cooling medium can flow downward toward the outer peripheral portion that is lower than the fixed portion. Consequently, it is possible to suppress uneven cooling of the outer peripheral portion that is lower than the fixed portion.
It should be noted that the present invention may be embodied in forms representing various devices, such as a rotary electric machine unit, a rotary electric machine, a cooling medium flow passage, a stator, and a vehicle provided with a stator cooling device, for example. In addition, the present invention may be embodied in forms representing various methods, such as a cooling method for cooling a stator.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a view showing a cross section of a rotary electric machine unit 1000 serving as an embodiment of the present invention;
FIG. 2 is an exploded perspective view of the rotary electric machine unit 1000;
FIG. 3 is a cross-sectional view taken along a line A-A in FIG. 1;
FIG. 4 is an enlarged view of a region CC in FIG. 3;
FIG. 5 is a cross-sectional view taken along a line D-D in FIG. 4;
FIG. 6 is a view showing a first injection hole 300A and a second injection hole 300B in a cooling medium flow passage 300 as a second embodiment;
FIG. 7 is a view illustrating a first modification example, and
FIG. 8 is a view illustrating a second modification example.
 DETAILED DESCRIPTION OF THE EMBODIMENTS A. First Embodiment A1. Configuration of Rotary Electric Machine Unit
FIG. 1 is a view showing a cross section of a rotary electric machine unit 1000 serving as a first embodiment of the present invention. In FIG. 1, an up-down direction serves as a vertical direction, and a left-right direction serves as a horizontal direction. In addition, an x direction, a y direction, and a z direction are defined as illustrated in FIG. 1. The z direction is an upward direction along the vertical direction, and the x direction and the y direction are directions along the horizontal direction. The x direction is orthogonal to the y direction. The x direction is a rightward direction in FIG. 1, and the y direction is a direction extending along a direction heading into the paper in FIG. 1. FIG. 2 is an exploded perspective view showing the rotary electric machine unit 1000. FIG. 1 corresponds to a view of a cross section taken along a line B-B in FIG. 2 as viewed from the y direction. FIG. 3 is a cross-sectional view taken along a line A-A in FIG. 1. Specifically, FIG. 3 is a view of a cross section taken along the line A-A in FIG. 1 as viewed from the x direction.
As shown in FIGS. 1 to 3, the rotary electric machine unit 1000 includes a rotary electric machine 100, a housing case 200, a cooling medium flow passage 300, and screws 400, 500. The cooling medium flow passage 300 will be described in detail later.
The rotary electric machine 100 includes a stator 10, a rotor 50, and a shaft 60, as shown in FIGS. 1 to 3. In this embodiment, the rotary electric machine unit 1000 (rotary electric machine 100) is disposed such that the shaft 60 is parallel to the x direction (horizontal direction). The rotary electric machine 100 functions as a motor and a generator. The rotor 50 is cylindrically formed, and a magnet is disposed inside the rotor 50. The rotor 50 is fixed to the shaft 60.
The stator 10 includes a stator core 20 and a coil 30 as shown in FIGS. 1 to 3. The stator core 20 is formed by laminating a plurality of stator laminated plates (not shown), each of which is a ring-shaped steel plate. The stator core 20 thus formed includes a stator main body 21 that is cylindrically formed, and a fixed portion group 25. The stator main body 21 includes a plurality of slot portions 21A disposed on an inner peripheral portion of the stator main body 21 at the same pitch. The coil 30 is wound in the slot portions 21A. A central axis of the stator core 20 (stator main body 21) coincides with a rotation axis of the rotary electric machine 100 (shaft 60). Hereinafter, the central axis will also be referred to as a central axis T. In addition, a direction along the central axis T will also be referred to as an axial direction. The axial direction coincides with the horizontal direction. Further, a direction extending from the stator main body 21 toward the central axis T will also be referred to as a radially inward direction, and a direction extending away from the central axis T and opposite the radially inward direction will also be referred to as a radially outward direction.
The fixed portion group 25 is formed of three fixed portions, that is, a first fixed portion 25A, a second fixed portion 25B, and a third fixed portion 25C, as shown in FIGS. 2 and 3. These three fixed portions are each formed on an outer peripheral portion of the stator main body 21 to protrude therefrom in the radially outward direction. Specifically, the three fixed portions are each formed into a substantially semi-cylindrical shape of the same size, and a semi-circular surface of each of the fixed portions faces toward the radially outward direction. That is, in this case, the three fixed portions are each formed on the outer peripheral portion of the stator main body 21 so as to protrude therefrom in a direction opposite the direction extending toward the central axis T as viewed in the axial direction (X direction). The first fixed portion 25A corresponds to a fixed portion according to the claims.
The three fixed portions each include a through hole 25X that penetrates through the fixed portion in the axial direction, and a peak portion 25Y that is a portion farthest of the fixed portion from the central axis T as viewed in the axial direction. The three fixed portions are disposed in the stator core 20 such that a triangle formed by connecting the peak portions 25Y of the three fixed portions is an equilateral triangle. In other words, the three fixed portions are disposed on the outer peripheral portion of the stator core 20 such that an interval between two adjacent fixed portions as viewed in the axial direction is equal. The first fixed portion 25A is disposed at a position above a horizontal plane (hereinafter also referred to as a horizontal plane M1) that passes through the central axis T, and the peak portion 25Y of the first fixed portion 25A is disposed at a position displaced from a vertical plane (hereinafter also referred to as a first vertical plane N1) that passes through the central axis T. The second fixed portion 25B and the third fixed portion 25C are disposed at positions below the horizontal plane M1.
The housing case 200 includes a case lid portion 200A and a case body portion 200B, as shown in FIGS. 1 to 3. The rotary electric machine 100 is housed inside the housing case 200. The case body portion 200B includes three recessed portions 201 in which the three fixed portions of the fixed portion group 25 are respectively disposed, and a recessed portion 202 in which the cooling medium flow passage 300 is disposed. As shown in FIG. 3, a predetermined clearance is provided between each recessed portion 201 and corresponding fixed portion. Further, as shown in FIG. 3, a predetermined clearance is also provided between the case body portion 200B and the stator main body 21. These clearances are capable of functioning as flow passages (described later) through which a cooling medium flows. The screw 400 fixes the case lid portion 200A to the case body portion 200B. The screw 500 is inserted into each through hole 25X (described later) that is axially formed in the fixed portion group 25 of the stator core 20, and fixes the stator core 20 to the case body portion 200B.
Note that, the stator core 20 (in particular, the stator main body 21 and the first fixed portion 25A overall) and the cooling medium flow passage 300 overall correspond to a stator cooling device according to the claims. Hereinafter, the stator core 20 and the cooling medium flow passage 300 will also be referred to overall as a stator cooling device 90.
A2. Configuration of Cooling Medium Flow Passage 300
FIG. 4 is an enlarged view showing a region CC in FIG. 3. FIG. 5 is a view showing a cross section taken along a line D-D in FIG. 4. The cooling medium flow passage 300 is a flow passage to which the cooling medium (for example, cooling oil or the like) for cooling the stator core 20 is supplied from a pump (not shown) disposed external to the rotary electric machine unit 1000.
The cooling medium flow passage 300 is disposed in the recessed portion 202 formed in the case body portion 200B so as to be parallel to the central axis T, as shown in FIGS. 2 to 4. In addition, the cooling medium flow passage 300 is disposed above the outer peripheral portion of the stator main body 21 and on the first vertical plane N1 side with respect to a vertical plane (hereinafter also referred to as a second vertical plane N2) that passes through the peak portion 25Y of the first fixed portion 25A. Specifically, as shown in FIG. 4, the cooling medium flow passage 300 is disposed on the first vertical plane N1, above an uppermost portion 21Y that is the highest region of the stator main body 21, and inward of a circle E that is formed about the central axis T and passes through the peak portion 25Y of the first fixed portion 25A as viewed in the axial direction. As shown in FIG. 5, the flow of the cooling medium is blocked at an end portion of the cooling medium flow passage 300 opposite the pump side.
As shown in FIGS. 4 and 5, the cooling medium flow passage 300 includes a first injection hole 300A and a second injection hole 300B. The first injection hole 300A corresponds to an injection hole that opens toward the fixed portion according to the claims.
As shown in FIG. 4, the first injection hole 300A is a hole through which the cooling medium is injected, and opens in the cooling medium flow passage 300 toward the first fixed portion 25A. The pump supplies the cooling medium to the cooling medium flow passage 300 at a sufficiently high pressure. Therefore, the first injection hole 300A is formed such that at least part of the injected cooling medium directly impacts the first fixed portion 25A. Specifically, as shown in FIG. 4, the first injection hole 300A is formed so as to inject the cooling medium such that an angle θ, which is an inferior angle, is obtusely formed between a line segment SA and a line segment SB. In this case, the line segment SA is a line segment that is on a tangent line passing through an impact position P1 at which the cooling medium injected through the first injection hole 300A impacts the first fixed portion 25A, and that extends from the impact position P1 toward the peak portion 25Y side of the first fixed portion 25A. The line segment SB is a line segment that passes through the impact position P1 and a substantially center of the first injection hole 300A. The impact position P1 is any point in a region of the first fixed portion 25A that the cooling medium injected through the first injection hole 300A directly impacts. For example, the impact position P1 is the center of gravity in such a region.
The second injection hole 300B is a hole through which the cooling medium is injected. As shown in FIG. 4, the second injection hole 300B opens in the cooling medium flow passage 300 toward a side opposite the first fixed portion 25A side. Specifically, in the stator main body 21, the outer peripheral portion above the horizontal plane M1 is divided by the first vertical plane N1 that passes through the central axis T. The outer peripheral portion is divided into the outer peripheral portion where the first fixed portion 25A is disposed (which will be referred to as a first outer peripheral portion UA), and the outer peripheral portion that is opposite the first outer peripheral portion UA (which will be referred to as a second outer peripheral portion UB). The second injection hole 300B is formed so as to inject the cooling medium toward the second outer peripheral portion UB.
The first injection hole 300A and the second injection hole 300B are disposed at the same position in the axial direction, as shown in FIG. 4. Moreover, the diameter of the first injection hole 300A is the same as that of the second injection hole 300B.
The rotary electric machine unit 1000 according to the present embodiment includes a discharge portion (not shown) for discharging the cooling medium. The cooling medium injected through the first injection hole 300A and the second injection hole 300B in the cooling medium flow passage 300 flows downward along the outer peripheral portion of the stator core 20 and reaches the lower portion of the stator core 20. The cooling medium is then discharged from the discharge portion to outside the rotary electric machine unit 1000, The cooling medium discharged from the discharge portion is cooled by a radiator (not shown) or the like disposed external to the rotary electric machine unit 1000, and again fed to the cooling medium flow passage 300 by the pump.
As shown in FIG. 5, the cooling medium flow passage 300 of the present embodiment includes, in addition to the first injection hole 300A and the second injection hole 300B, a plurality of injection holes 300X through which the cooling medium is injected to cool the coil 30. The cooling medium supplied to the cooling medium flow passage 300 is injected through any one of the first injection hole 300A, the second injection hole 300B, and the injection holes 300X.
According to the rotary electric machine unit 1000 of the present embodiment, as shown in FIG. 3, the first fixed portion 25A is disposed in the stator core 20 at a position above the horizontal plane M1 that passes through the central axis T of the stator main body 21, and the peak portion 25Y is disposed at a position displaced from the first vertical plane N1 as viewed in the axial direction. With this configuration, it is possible to reduce a height of the stator core 20 in the vertical direction, and make the rotary electric machine unit 1000 (especially the stator cooling device 90) more compact.
According to the rotary electric machine unit 1000 of the present embodiment, as shown in FIG. 4, the first injection hole 300A of the cooling medium flow passage 300 opens toward the first fixed portion 25A. With this configuration, the cooling medium injected through the first injection hole 300A can directly impact and pass over the first fixed portion 25A, and flow downward toward the outer peripheral portion that is lower than the first fixed portion 25A in the stator core 20 (the outer peripheral portion that is lower than the first fixed portion 25A and on the right side of the first vertical plane N1 in the stator core 20 in FIG. 3). This makes it possible to cool the outer peripheral portion that is lower than the first fixed portion 25A. Consequently, uneven cooling of the stator core 20 (stator main body 21) can be suppressed.
According to the rotary electric machine unit 1000 of the present embodiment, as shown in FIG. 4, the cooling medium flow passage 300 (first injection hole 300A) is disposed above the outer peripheral portion of the stator main body 21 and on the first vertical plane N1 side with respect to the second vertical plane N2 that passes through the peak portion 25Y of the first fixed portion 25A. With this configuration, the cooling medium can be injected through the first injection hole 300A such that the cooling medium directly impacts the first fixed portion 25A and passes over the first fixed portion 25A.
According to the rotary electric machine unit 1000 of the present embodiment, as shown in FIG. 4, the cooling medium is injected through the first injection hole 300A such that the angle θ, which is an inferior angle, is obtusely formed between the line segment SA and the line segment SB, with the line segment SA being a line segment that is on the tangent line passing through the impact position P1 at which the cooling medium impacts the first fixed portion 25A, and that extends from the impact position P1 toward the peak portion 25Y side of the first fixed portion 25A, and the line segment SB passing through the impact position P1 and the substantially center of the first injection hole 300A. With this configuration, the cooling medium injected through the first injection hole 300A can easily pass over the first fixed portion 25A and flow downward toward the outer peripheral portion that is lower than the first fixed portion 25A in the stator core 20 (the outer peripheral portion that is lower than the first fixed portion 25A and on the right side of the first vertical plane N1 in the stator core 20 in FIG. 3), thereby promoting the cooling of the outer peripheral portion that is lower than the first fixed portion 25A.
According to the rotary electric machine unit 1000 of the present embodiment, as shown in FIG. 4, at least part of the first injection hole 300A is disposed inward of the circle E that is formed about the central axis T and passes through the peak portion 25Y of the first fixed portion 25A as viewed in the axial direction. With this configuration, the cooling medium flow passage 300 and the stator core 20 are disposed close to each other, and this makes it possible to achieve a more compact rotary electric machine unit 1000 (especially the stator cooling device 90).
According to the rotary electric machine unit 1000 of the present embodiment, as shown in FIG. 4, the second injection hole 300B is provided so as to inject the cooling medium toward the second outer peripheral portion UB that is on the side opposite the first outer peripheral portion UA where the first fixed portion 25A is disposed, among the outer peripheral portion of the stator main body 21 above the horizontal plane M1 that passes through the central axis T, which is divided by the first vertical plane N1 that passes through the central axis T. With this configuration, the cooling medium can be injected to the second outer peripheral portion UB in addition to the first outer peripheral portion UA, whereby it is possible to also cool the second outer peripheral portion UB. Moreover, the cooling medium injected toward the second outer peripheral portion UB flows downward toward and can cool the outer peripheral portion that is lower than the second outer peripheral portion UB in the stator core 20 (the outer peripheral portion that is lower than the horizontal plane M1 and on the left side of the first vertical plane N1 in the stator core 20 in FIG. 3). Consequently, in the stator core 20, it is possible to cool the outer peripheral portion that includes the second outer peripheral portion UB among the outer peripheral portion divided by the first vertical plane N1 (the outer peripheral portion on the left side of the first vertical plane N1 in the stator core 20 in FIG. 3), whereby uneven cooling of the stator core 20 (stator main body 21) can be suppressed.
According to the rotary electric machine unit 1000 of the present embodiment, as shown in FIG. 4, the first injection hole 300A and the second injection hole 300B are disposed at the same position in the axial direction. With this configuration, in the stator core 20, the cooling medium is injected toward each of the first outer peripheral portion UA and the second outer peripheral portion UB from the same position in the axial direction. Accordingly, uneven cooling in the axial direction between the first outer peripheral portion UA side and the second outer peripheral portion UB side can be suppressed. Specifically, it is possible to suppress uneven cooling between positions on the first outer peripheral portion UA side and the second outer peripheral portion UB side that are symmetrical in the axial direction with respect to the first vertical plane N1.
According to the rotary electric machine unit 1000 of the present embodiment, as shown in FIG. 3, the second fixed portion 258 and the third fixed portion 25C of the stator core 20 are disposed at positions that are lower than the horizontal plane M1. With this configuration, the cooling medium injected through the first injection hole 300A and the second injection hole 300B in the cooling medium flow passage 300 can pass over the second fixed portion 25B and the third fixed portion 25C by the force of gravity when the cooling medium reaches the second fixed portion 25B and the third fixed portion 25C. Consequently, it is possible to suppress the second fixed portion 25B and the third fixed portion 25C from interfering with the downward flow of the cooling medium, and thus possible to suppress uneven cooling of the stator core 20 (stator main body 21).
According to the rotary electric machine unit 1000 of the present embodiment, as shown in FIG. 3, the three fixed portions in the fixed portion group 25 are disposed on the outer peripheral portion of the stator core 20 such that there is an equal interval between two adjacent fixed portions as viewed in the axial direction. With this configuration, the stator core 20 can be firmly fixed to the case body portion 200B, and it is possible to prevent the stator core 20 from rotating.
B. Second Embodiment B1. Configuration of First Injection Hole 300A
FIG. 6 is a view showing the first injection hole 300A and the second injection hole 300B in the cooling medium flow passage 300 serving as a second embodiment. In the first embodiment, above, the first injection hole 300A and the second injection hole 300B are configured to have the same diameter. However, in the second embodiment, as shown in FIG. 6, the first injection hole 300A is configured to have a smaller diameter than the second injection hole 300B.
According to the cooling medium flow passage 300 of the present embodiment, as shown in FIG. 6, the first injection hole 300A has a smaller diameter than the second injection hole 300B. With this configuration, the cooling medium can be more strongly injected through the first injection hole 300A, compared to the second injection hole 300B. Accordingly, the cooling medium injected through the first injection hole 300A can easily pass over the first fixed portion 25A, and therefore, a large amount of the cooling medium can flow downward toward the outer peripheral portion that is lower than the first fixed portion 25A (the outer peripheral portion on the right side of the first vertical plane N1 in the stator core 20 in FIG. 3). Consequently, it is possible to suppress uneven cooling of the outer peripheral portion that is lower than the first fixed portion 25A.
C. Modification Examples
It should be noted that structural elements described in the embodiments above other than the structural elements claimed in the independent claim are additional, and may be omitted as appropriate. Further, the present invention is not limited to the examples and embodiments above, and may be embodied in various modes without departing from the scope of the present invention. For example, the following modifications are possible.
C1. First Modification Example
In the embodiments above, the cooling medium is injected through the first injection hole 300A such that the angle θ, which is an inferior angle, is obtusely formed between the line segment SA and the line segment SB, with the line segment SA being a line segment that is on a tangent line passing through the impact position P1 at which the cooling medium impacts the first fixed portion 25A, and that extends from the impact position P1 toward the peak portion 25Y side of the first fixed portion 25A, and the line segment SB passing through the impact position P1 and the substantially center of the first injection hole 300A. However, the present invention is not limited to this example. The following configuration may be employed, for example.
FIG. 7 is a view illustrating a first modification example. Specifically, FIG. 7 is an enlarged view around the cooling medium flow passage 300 and the first fixed portion 25A. The first injection hole 300A may be disposed in the cooling medium flow passage 300 such that an angle θa, which is an inferior angle, is obtusely formed between a line segment SC and a line segment SD in FIG. 7. In this case, a tangent line SS is a tangent line in the region where the first fixed portion 25A is disposed in the stator main body 21 and passes through the substantially center of the first injection hole 300A, and an intersection point P2 is set as a point at which the tangent line SS intersects with a surface of the first fixed portion 25A on the first vertical plane N1 side. The line segment SC is a line segment that is on the tangent line SS and that passes through the intersection point P2 and the substantially center of the first injection hole 300A. The line segment SD is a line segment that is on a tangent line at the intersection point P2 of the first fixed portion 25A and that extends from the intersection point P2 toward the peak portion 25Y side of the first fixed portion 25A. With this configuration, the cooling medium injected through the first injection hole 300A can easily pass over the first fixed portion 25A and flow downward toward the outer peripheral portion that is lower than the first fixed portion 25A (the outer peripheral portion on the right side of the first vertical plane N1 in the stator core 20 in FIG. 3), thereby promoting the cooling of the outer peripheral portion that is lower than the first fixed portion 25A.
C2. Second Modification Example
In the embodiments and the modification example above, the cooling medium flow passage 300 is disposed on the first vertical plane N1, above the uppermost portion 21Y that is the highest region of the stator main body 21, and inward of the circle E that is formed about the central axis T and passes through the peak portion 25Y of the first fixed portion 25A as viewed in the axial direction. However, the present invention is not limited to this.
FIG. 8 is a view illustrating a second modification example. Specifically, FIG. 8 is a view illustrating a positional relationship between the stator core 20 (first fixed portion 25A) and the cooling medium flow passage 300. The present invention may employ the configuration in which, as shown in FIG. 8, the cooling medium flow passage 300 is disposed at any position in the region above the outer peripheral portion of the stator main body 21 on the first vertical plane N1 side with respect to the second vertical plane N2 that passes through the peak portion 25Y of the first fixed portion 25A (a hatched region in FIG. 8; hereinafter also referred to as a region MM). For example, as shown in FIG. 8, the present invention may employ a configuration in which the cooling medium flow passage 300 is provided at a position in the region MM that is displaced toward the first fixed portion 25A with respect to the first vertical plane N1, instead of being disposed on the first vertical plane N1.
C3. Third Modification Example
In the embodiments and modification examples above, the cooling medium flow passage 300 is disposed in the recessed portion 202 formed in the case body portion 200B. However, the present invention is not limited to this. For example, a passage formed by hollowing out the inside of the case body portion 200B may be used as the cooling medium flow passage 300. In this case, the first injection hole 300A and the second injection hole 300B are formed by through holes that penetrate through the case body portion 200B. With this configuration, it is no longer necessary to provide the cooling medium flow passage 300 as a separate component of the case body portion 200B, and therefore the number of components can be reduced.
C4. Fourth Modification Example
In the embodiments and modification examples above, the cooling medium flow passage 300 is disposed inward of the circle E as viewed in the axial direction. However, the present invention is not limited to this example. For example, the present invention may employ a configuration in which at least part of the cooling medium flow passage 300 (for example, at least part of the first injection hole 300A) is disposed inward of the circle E. With this configuration, the rotary electric machine unit 1000 (especially the stator cooling device 90) can be made more compact.
C5. Fifth Modification Example
In the embodiments and modification examples above, the first injection hole 300A and the second injection hole 300B are disposed at the same position in the axial direction. For example, the present invention is not limited to this example. However, in the cooling medium flow passage 300, the first injection hole 300A may be disposed at a position closer to the side where the pump that feeds the cooling medium (see FIG. 5) is disposed, with respect to the second injection hole 300B. With this configuration, the cooling medium can be more strongly injected through the first injection hole 300A compared to the second injection hole 300B. Accordingly, the cooling medium injected through the first injection hole 300A can easily pass over the first fixed portion 25A, and a large amount of the cooling medium can flow downward toward the outer peripheral portion that is lower than the first fixed portion 25A (the outer peripheral portion on the right side of the first vertical plane N1 in the stator core 20 in FIG. 3). Consequently, it is possible to suppress uneven cooling of the outer peripheral portion that is lower than the first fixed portion 25A.
C6. Sixth Modification Example
In the embodiments and modification examples above, the rotary electric machine 100 can function as both a motor and a generator. However, the present invention is not limited to this. For example, the rotary electric machine 100 may only function as a generator without functioning as a motor. Alternatively, the rotary electric machine 100 may only function as a motor without functioning as a generator.
The present invention is well suited for use in cooling a stator of a rotary electric machine.

Claims (16)

What is claimed is:
1. A stator cooling device, comprising:
a cylindrical stator main body that uses a rotation axis of a rotary electric machine as a central axis;
a fixed portion that is formed on an outer peripheral portion of the stator main body so as to protrude outward in a radial direction of the stator main body, and fixes the stator main body to a case that houses the rotary electric machine; and
a cooling medium flow passage into which a cooling medium is supplied and that includes an injection hole through which the cooling medium is injected, wherein
the fixed portion is disposed above a horizontal plane that passes through the central axis, and a peak portion that is farthest in the fixed portion from the central axis as viewed in an axial direction of the central axis is disposed at a position displaced from a first vertical plane that is a vertical plane that passes through the central axis, and
the injection hole opens toward the fixed portion above the outer peripheral portion of the stator main body and toward the first vertical plane side with respect to a second vertical plane that is a vertical plane that passes through the peak portion.
2. The stator cooling device according to claim 1, wherein the cooling medium is injected through the injection hole such that an angle, which is an inferior angle, is obtusely formed between a line segment, which is a line segment that is on a tangent line passing through an impact position at which the cooling medium injected through the injection hole impacts the fixed portion, and that extends from the impact position toward the peak portion side, and another line segment, which passes through the impact position and the injection hole.
3. The stator cooling device according to claim 2, wherein at least part of the injection hole is disposed inward of a circle that is formed about the central axis and passes through the peak portion as viewed in the axial direction.
4. The stator cooling device according to claim 3, wherein
if the injection hole is referred to as a first injection hole,
the cooling medium flow passage includes
a second injection hole that is different from the first injection hole, and through which the cooling medium is injected toward a second outer peripheral portion, wherein a first outer peripheral portion and the second outer peripheral portion are formed by dividing the outer peripheral portion of the stator main body above the horizontal plane that passes through the central axis by the first vertical plane that passes through the central axis such that the fixed portion is disposed in the first outer peripheral portion, and the second outer peripheral portion is opposite the first outer peripheral portion.
5. The stator cooling device according to claim 4, wherein the first injection hole and the second injection hole are disposed at a same position in the axial direction.
6. The stator cooling device according to claim 5, wherein the first injection hole has a smaller diameter than the second injection hole.
7. The stator cooling device according to claim 1, wherein at least part of the injection hole is disposed inward of a circle that is formed about the central axis and passes through the peak portion as viewed in the axial direction.
8. The stator cooling device according to claim 2, wherein
if the injection hole is referred to as a first injection hole,
the cooling medium flow passage includes
a second injection hole that is different from the first injection hole, and through which the cooling medium is injected toward a second outer peripheral portion, wherein a first outer peripheral portion and the second outer peripheral portion are formed by dividing the outer peripheral portion of the stator main body above the horizontal plane that passes through the central axis by the first vertical plane that passes through the central axis such that the fixed portion is disposed in the first outer peripheral portion, and the second outer peripheral portion is opposite the first outer peripheral portion.
9. The stator cooling device according to claim 7, wherein
if the injection hole is referred to as a first injection hole,
the cooling medium flow passage includes
a second injection hole that is different from the first injection hole, and through which the cooling medium is injected toward a second outer peripheral portion, wherein a first outer peripheral portion and the second outer peripheral portion are formed by dividing the outer peripheral portion of the stator main body above the horizontal plane that passes through the central axis by the first vertical plane that passes through the central axis such that the fixed portion is disposed in the first outer peripheral portion, and the second outer peripheral portion is opposite the first outer peripheral portion.
10. The stator cooling device according to claim 8, wherein the first injection hole and the second injection hole are disposed at a same position in the axial direction.
11. The stator cooling device according to claim 9, wherein the first injection hole and the second injection hole are disposed at a same position in the axial direction.
12. The stator cooling device according to claim 4, wherein the first injection hole has a smaller diameter than the second injection hole.
13. The stator cooling device according to claim 8, wherein the first injection hole has a smaller diameter than the second injection hole.
14. The stator cooling device according to claim 9, wherein the first injection hole has a smaller diameter than the second injection hole.
15. The stator cooling device according to claim 10, wherein the first injection hole has a smaller diameter than the second injection hole.
16. The stator cooling device according to claim 11, wherein the first injection hole has a smaller diameter than the second injection hole.
US13/282,925 2010-11-22 2011-10-27 Stator cooling device Active 2032-07-30 US8653705B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010260412A JP5505275B2 (en) 2010-11-22 2010-11-22 Stator cooling device
JP2010-260412 2010-11-22

Publications (2)

Publication Number Publication Date
US20120126641A1 US20120126641A1 (en) 2012-05-24
US8653705B2 true US8653705B2 (en) 2014-02-18

Family

ID=46063691

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/282,925 Active 2032-07-30 US8653705B2 (en) 2010-11-22 2011-10-27 Stator cooling device

Country Status (5)

Country Link
US (1) US8653705B2 (en)
JP (1) JP5505275B2 (en)
CN (1) CN103119830B (en)
DE (1) DE112011102609B9 (en)
WO (1) WO2012070191A1 (en)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5974213B2 (en) * 2012-09-18 2016-08-23 株式会社明電舎 Stator fixing structure
JP6163071B2 (en) * 2013-09-26 2017-07-12 株式会社Ｓｕｂａｒｕ Cooling structure of rotary motive
EP2930827B1 (en) * 2014-04-10 2016-07-27 Siemens Aktiengesellschaft Electric machine with flow cooling
JP6574720B2 (en) * 2016-02-16 2019-09-11 株式会社Ｓｕｂａｒｕ Cooling mechanism
JP6606455B2 (en) * 2016-03-30 2019-11-13 株式会社Ｓｕｂａｒｕ Cooling mechanism
JP6726071B2 (en) * 2016-09-29 2020-07-22 株式会社Ｓｕｂａｒｕ Motor cooling mechanism
DE102016224066A1 (en) * 2016-12-02 2018-06-07 Volkswagen Aktiengesellschaft Stator for an electric machine, manufacturing method and electric machine for a motor vehicle
JP2019030041A (en) * 2017-07-25 2019-02-21 トヨタ自動車株式会社 Rotary electric machine
JP7187292B2 (en) * 2018-03-05 2022-12-12 パナソニックホールディングス株式会社 Speed compressor and refrigeration cycle equipment
JP2021129339A (en) * 2020-02-10 2021-09-02 日本電産株式会社 Drive device
CN112152341B (en) * 2019-06-28 2023-08-22 日本电产株式会社 Driving device
JP7310491B2 (en) * 2019-09-25 2023-07-19 ニデック株式会社 drive
US11496023B2 (en) * 2019-06-28 2022-11-08 Nidec Corporation Drive apparatus
JP7452056B2 (en) * 2020-02-10 2024-03-19 ニデック株式会社 drive device
DE102020107116A1 (en) 2020-03-16 2021-09-16 Schaeffler Technologies AG & Co. KG Combined oil cooling concept for an electric machine with a rotor-integrated clutch, electric machine, drive train and method for cooling an electric machine
JP7415749B2 (en) * 2020-03-31 2024-01-17 ニデック株式会社 drive device
JP7459622B2 (en) * 2020-03-31 2024-04-02 ニデック株式会社 drive device
WO2022107371A1 (en) * 2020-11-19 2022-05-27 日本電産株式会社 Rotary electric machine and drive device
JP2022081326A (en) * 2020-11-19 2022-05-31 日本電産株式会社 Rotary electric machine and driving device
JP7468410B2 (en) * 2021-03-04 2024-04-16 株式会社アイシン Rotating Electric Machine
CN113364190A (en) * 2021-05-25 2021-09-07 浙江亚特电器有限公司 Motor with small air gap, machining and assembling method of motor and electric tool
DE102022128307A1 (en) 2022-10-26 2024-05-02 Schaeffler Technologies AG & Co. KG stator

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4262224A (en) * 1978-06-29 1981-04-14 Robert Bosch Gmbh Oil cooling for an electrical generator
US4293788A (en) * 1978-06-20 1981-10-06 Robert Bosch Gmbh Three-phase vehicular generator construction
JPS62260544A (en) 1986-04-07 1987-11-12 Mitsubishi Electric Corp Ac generator for vehicle
US4739204A (en) * 1986-01-30 1988-04-19 Mitsubishi Denki Kabushiki Kaisha Liquid cooled a.c. vehicle generator
US5939806A (en) * 1996-12-23 1999-08-17 Mando Machinery Corporation Drive motor for an electric vehicle
US6787949B2 (en) * 2002-07-24 2004-09-07 Emerson Electric Co. Optimized thermal system for an electric motor
US7042121B2 (en) * 2004-07-30 2006-05-09 Siemens Aktiengesellschaft Cooling fan with electric motor
JP2008178243A (en) 2007-01-19 2008-07-31 Toyota Motor Corp Magnet temperature estimating device, magnet protecting device, magnet temperature estimating method, and magnet protecting method
JP2009017700A (en) 2007-07-05 2009-01-22 Toyota Motor Corp Cooling device of rotating electric machine
US7538457B2 (en) * 2006-01-27 2009-05-26 General Motors Corporation Electric motor assemblies with coolant flow for concentrated windings
US7576458B2 (en) * 2002-10-18 2009-08-18 Baumuller Nurnberg Gmbh Dipping varnish-coated cooling shell of a housing for an electric machine
US8067865B2 (en) * 2008-10-28 2011-11-29 Caterpillar Inc. Electric motor/generator low hydraulic resistance cooling mechanism

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2782354B1 (en) * 1998-07-28 2001-03-30 Valeo Equip Electr Moteur FRICTION CLUTCH CARRYING THE ROTOR OF AN ELECTRIC MACHINE, PARTICULARLY FOR A MOTOR VEHICLE
JP2009195083A (en) * 2008-02-18 2009-08-27 Toyota Motor Corp Cooling structure of a stator, manufacturing method therefor, and rotating machine
CN101777816B (en) * 2009-12-08 2012-09-05 精进电动科技（北京）有限公司 Motor and method for oil cooling to motor

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4293788A (en) * 1978-06-20 1981-10-06 Robert Bosch Gmbh Three-phase vehicular generator construction
US4262224A (en) * 1978-06-29 1981-04-14 Robert Bosch Gmbh Oil cooling for an electrical generator
US4739204A (en) * 1986-01-30 1988-04-19 Mitsubishi Denki Kabushiki Kaisha Liquid cooled a.c. vehicle generator
JPS62260544A (en) 1986-04-07 1987-11-12 Mitsubishi Electric Corp Ac generator for vehicle
US4818906A (en) 1986-04-07 1989-04-04 Mitsubishi Denki Kabushiki Kaisha Vehicle mounted A.C. generator
US5939806A (en) * 1996-12-23 1999-08-17 Mando Machinery Corporation Drive motor for an electric vehicle
US6787949B2 (en) * 2002-07-24 2004-09-07 Emerson Electric Co. Optimized thermal system for an electric motor
US7576458B2 (en) * 2002-10-18 2009-08-18 Baumuller Nurnberg Gmbh Dipping varnish-coated cooling shell of a housing for an electric machine
US7042121B2 (en) * 2004-07-30 2006-05-09 Siemens Aktiengesellschaft Cooling fan with electric motor
US7538457B2 (en) * 2006-01-27 2009-05-26 General Motors Corporation Electric motor assemblies with coolant flow for concentrated windings
JP2008178243A (en) 2007-01-19 2008-07-31 Toyota Motor Corp Magnet temperature estimating device, magnet protecting device, magnet temperature estimating method, and magnet protecting method
JP2009017700A (en) 2007-07-05 2009-01-22 Toyota Motor Corp Cooling device of rotating electric machine
US8067865B2 (en) * 2008-10-28 2011-11-29 Caterpillar Inc. Electric motor/generator low hydraulic resistance cooling mechanism

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Feb. 14, 2012 International Search Report issued in PCT/JP2011/005237 (with translation).

Also Published As

Publication number Publication date
DE112011102609B9 (en) 2022-03-24
CN103119830B (en) 2015-06-10
DE112011102609T5 (en) 2013-05-29
JP2012115001A (en) 2012-06-14
WO2012070191A1 (en) 2012-05-31
JP5505275B2 (en) 2014-05-28
CN103119830A (en) 2013-05-22
DE112011102609B4 (en) 2021-05-06
US20120126641A1 (en) 2012-05-24

Similar Documents

Publication Publication Date Title
US8653705B2 (en) Stator cooling device
US8663020B2 (en) Shaft
JP5772544B2 (en) Cooling structure of rotating electric machine
US9154006B2 (en) Rotor for rotating electric machine
US8269382B2 (en) Cooling structure of stator
US20110127862A1 (en) Electric machine having radial dividers for guiding cooling air
US10447115B2 (en) Rotary electric machine and driving system
JP2011036024A (en) Cooling structure of stator
JP2012105487A (en) Cooling device for electric motor
JP7469272B2 (en) motor
US20190280536A1 (en) Rotary electric machine cooling structure
JP5549857B2 (en) Rotor for rotating electrical machines
JP2009089513A (en) Cooling structure in rotary electric machine
JP2020198706A (en) Rotary electric machine
US20200280226A1 (en) Rotor of rotary electric machine
JP2009081953A (en) Rotating electric machine
US20200220425A1 (en) Rotor and motor including same
JP2017131078A (en) Cooling structure of motor
JP2013207930A (en) Stator structure of rotary electric machine
EP2744086B1 (en) Coolant supplying and collecting apparatus and motor including the same
CN111030336B (en) Rotor
JP2012217233A (en) Rotary electric machine
US20200280227A1 (en) Rotor of rotary electric machine
WO2017141867A1 (en) Motor cooling structure
JP6272526B1 (en) Rotating electric machine

Legal Events

Date Code Title Description
AS Assignment

Owner name: AISIN AW CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MURAKAMI, SATOSHI;REEL/FRAME:027138/0209

Effective date: 20111025

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 8TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1552); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 8